The practice of ________ ultimately guaranteed that there would be a significant degree of age segregation within adolescent peer groups

Despite its dangers, a young man continues to take cocaine because of the feeling of euphoria it produces for him. This powerful arousal of his nervous system is probably due to cocaine's ability to

A) inhibit enzymes that break down neurotransmitters. B) increase the release of neurotransmitters. C) block the receptor sites for neurotransmitters. D) prevent neurotransmitters from being reabsorbed into presynaptic terminals.

Research on social support has shown

a. that the buffering effect of social support is limited to women. b. the link between social support and better health outcomes has been found only in the U.S. and Canada. c. that perception of quality of support is more strongly related to health than the amount of contact with others. d. that well-intentioned social support has only beneficial effects on the recipient.